Koopa Troopas are a series of turtle-like creatures that usually appear as common enemies throughout the Mario series of games. Their shells come in many different colors, although red and green are the most common variety. They are usually defeated by jumping on them, which will knock them out of their shells and then jumped on; their shells can be picked up and used in a variety of ways.
While they have largely appeared as enemies, they have also appeared as allies to Mario and his friends, such as Kooper from Paper Mario. Koopa Troops have also been playable in a few of the Mario games, with its first playable appearance being Super Mario Kart. They also appear playable in Double Dash, Mario Kart Wii, Mario Kart 7, Mario's Tennis, Mario Power Tennis, Mario Party 9, Mario Golf: Toadstool Tour, and in the Mario Baseball series.
